JXL: added ImageTransformation option

Let Qt rotate the image when the ImageAutotransform option is set to true.

In tests it also solves the image size control with the value returned by the options with certain rotations.

src/imageformats/jxl_p.h

@@ -64,6 +64,7 @@ private:
     int m_quality;
     int m_currentimage_index;
     int m_previousimage_index;
+    QImageIOHandler::Transformations m_transformations;
 
     QByteArray m_rawData;